Discussion on the Need to impose Upper Limits to AUTO ISO -
Mar 20, 2019 23:17:09 #
RRS wrote:
Well you asked what the blinking in the viewfinde... (show quote)
Well, thanks, RRS … that's something to keep all the naysayers at bay, in the future - huh?
Yes, I have now made a point of setting both minimum acceptable shutter speed (Nikons, only) and have capped the AUTO ISO on ALL my DSLRs - to something I feel I can live with, based on its rated capability.
Mar 20, 2019 23:59:04 #
Chris T wrote:
Three of these four were shot at f22, Awesome, so, I suspect the D5300 was on AP for all four. The one exception was the reflection in the pool - which necessitated opening up to f10. Except, for the latter, which used a shutter speed of 1/1600 - the others were all 1/4000. And, except for the latter - whose ISO was down to 5600, the rest all went to 8000 ISO, or higher. Such is AUTO ISO - left to its own devices!!!
IF your D5300 acts as per my Nikon when in 'Aperture Priority' and 'Auto ISO' the results of those images (unnecessary high ISOs) were due to YOU having entered in an 'ISO Value'.
When in 'Auto ISO' the camera will NOT choose an ISO value that is LOWER than that which is set in the camera.
For my Nikon;
a) if the ISO is set at 100, I select AP and f/22, then select 'Auto ISO' and shoot an average sunny scene the result is around f/22, 1/25th, ISO100
but
b) if the ISO is set at 4000, I select AP and f/22, then select 'Auto ISO' and shoot the same average sunny scene the result is f/22, 1/1250th, ISO4000
Both these results, giving exactly the same exposures, are achieved with a 'the max ISO set to max value' and 'minimum speed set at 1s' in the 'Auto ISO' configuration menu.
Mar 21, 2019 00:13:29 #
Grahame wrote:
IF your D5300 acts as per my Nikon when in 'Apertu... (show quote)
Thanks Grahame. You confirm what I said I suspected. Without the user setting a high ISO the camera would have first gone with a slower shutter speed. I only started experimenting with auto ISO very recently.
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Mar 21, 2019 00:43:33 #
Bill_de wrote:
Thanks Grahame. You confirm what I said I suspected. Without the user setting a high ISO the camera would have first gone with a slower shutter speed. I only started experimenting with auto ISO very recently.
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That's how both my D300 and D800 work.
So the ops camera was 'most likely' doing nothing it's not supposed to wrt to the high ISO images, there was no magic, no puzzle or things happening due to clever designers but simply unawareness and lack of monitoring of what was happening.
Mar 21, 2019 02:06:39 #
Grahame wrote:
That's how both my D300 and D800 work.
So the ops camera was 'most likely' doing nothing it's not supposed to wrt to the high ISO images, there was no magic, no puzzle or things happening due to clever designers but simply unawareness and lack of monitoring of what was happening.
So the ops camera was 'most likely' doing nothing it's not supposed to wrt to the high ISO images, there was no magic, no puzzle or things happening due to clever designers but simply unawareness and lack of monitoring of what was happening.
Lack of Monitoring? - Perhaps … but, there was very little intervention by me. There was no upper ISO limit, nor minimum shutter speed, at that time. The camera produced a very effective shot, without my doing much more than selecting maximum DOF thru AP mode, and allowing AUTO ISO to do its effective best.
Mar 21, 2019 03:11:55 #
Chris T wrote:
Lack of Monitoring? - Perhaps … but, there was very little intervention by me.
Perhaps more likely, little known intervention that would have a bearing on the cameras performance.
Chris T wrote:
There was no upper ISO limit,
I think you will find that there 'HAS' to be a 'Maximum Sensitivity (ISO)' set when using 'Auto ISO'.
On my Nikons the only options available in the menu list for this value are from base ISO to max ISO.
Chris T wrote:
nor minimum shutter speed, at that time.
I think you will find that there 'HAS' to be a 'Minimum Shutter Speed' set when using 'Auto ISO'.
On my camera this ranges from 1s to 1/4000s. OR, there is one option for 'Auto' which derives Speed based upon the lens focal length.
There is NO option to have NOTHING set is these user selected values. What these are set at as 'default' on a 'new' camera I have no idea but the manual will likely say.
Chris T wrote:
The camera produced a very effective shot, without my doing much more than selecting maximum DOF thru AP mode, and allowing AUTO ISO to do its effective best.
I would disagree, it took a shot that was acceptably exposed but suffered from unnecessary noise. And, in addition 'Auto ISO' did NOT do its effective best.
Mar 21, 2019 09:46:02 #
Chris T wrote:
Lack of Monitoring? - Perhaps … but, there was very little intervention by me. There was no upper ISO limit, nor minimum shutter speed, at that time. The camera produced a very effective shot, without my doing much more than selecting maximum DOF thru AP mode, and allowing AUTO ISO to do its effective best.
Earlier you said you don't remember the settings, then you said you didn't pay attention to the settings. Now that somebody pointed out what might have been the error of your ways your memory has cleared.
Have you ever admitted, at least to yourself, that you might have made a mistake?
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Mar 21, 2019 11:10:37 #
Grahame wrote:
I would disagree, it took a shot that was acceptably exposed but suffered from unnecessary noise. And, in addition 'Auto ISO' did NOT do its effective best.
There's NO noise in that picture, Grahame …
Mar 21, 2019 11:39:23 #
Bill_de wrote:
Earlier you said you don't remember the settings, then you said you didn't pay attention to the settings. Now that somebody pointed out what might have been the error of your ways your memory has cleared.
Have you ever admitted, at least to yourself, that you might have made a mistake?
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Have you ever admitted, at least to yourself, that you might have made a mistake?
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Nope!!!
Mar 21, 2019 14:03:08 #
Chris T wrote:
Yes, I think he's right, Mike …
ISO in digital cameras - is probably best left to the camera - to make the right decision - for the scene!
ISO in digital cameras - is probably best left to the camera - to make the right decision - for the scene!
The camera has NO WAY of knowing what is in my imagination when I am composing an image or what effect I want to see in the resulting image.
Looking at it another way: I PREFER to make my own errors!
Mar 21, 2019 15:24:35 #
Chris T wrote:
There's NO noise in that picture, Grahame …
Do you actually ever read the replies and advice you are given, or do you deliberately ignore certain parts of it?
I clearly stated, "it took a shot that was acceptably exposed but suffered from unnecessary noise."
You reply "There was NO noise in that picture".
In an earlier post I advised you that the image had in camera 'High ISO Noise Reduction" applied at the 'HIGHEST' level. This will reduce the noise plus soften the image as is evident.
These are not guesses on my part, they are derived from examining the workings of the Nikon system and in addition looking at the EXIF carefully.
As with the ISO10,000 of that image, it's clearly shown in the EXIF that a high 'User Set' ISO value was entered of which the camera used as opposed to a lower value that 'Auto ISO' would have chosen if the 'User Set' value had of been set lower.
Mar 21, 2019 15:27:19 #
cambriaman wrote:
The camera has NO WAY of knowing what is in my imagination when I am composing an image or what effect I want to see in the resulting image.
Looking at it another way: I PREFER to make my own errors!
Looking at it another way: I PREFER to make my own errors!
That's quite true, Cam … but, if you're going to leave ONE thing up to the camera, it's better to make it ISO!
Mar 21, 2019 15:58:55 #
Grahame wrote:
Do you actually ever read the replies and advice y... (show quote)
You're absolutely RIGHT, Grahame … when I see a couple of negatively-written responses, when I've clearly stated I did not use any minimum shutter speed, nor maximum ISO, back when I shot those pics, three years ago, as I did not know enough to set any parameters, at the time - I chose not to follow on, as I completely lost interest in the thread. The whole point in writing it was to point out camera designers obviously know better than us - what we're attempting to achieve. If the responses don't follow that argument, but, constantly harp on about what I did wrong … I do have the right to ignore all that. It's much better for my mental health. I hope you understand the POV …. and if you don't - 's NO BIG DEAL!
Mar 21, 2019 16:15:55 #
Chris T wrote:
You're absolutely RIGHT, Grahame … when I see a couple of negatively-written responses, when I've clearly stated I did not use any minimum shutter speed, nor maximum ISO, back when I shot those pics, three years ago, as I did not know enough to set any parameters, at the time - I chose not to follow on, as I completely lost interest in the thread.
Yes, it's very obvious you have lost interest or do not understand the technicalities of why a certain result was obtaind.
Chris T wrote:
The whole point in writing it was to point out camera designers obviously know better than us - what we're attempting to achieve.
Which you have totally failed to do
Mar 21, 2019 17:01:22 #
Grahame wrote:
Which you have totally failed to do
The only thing I've failed to do, here - is to underscore enough the Topic of the Post - and allow myself to get waylaid by NEGATIVE commenters, who, clearly have nothing better to do, than sting as much as they can!
BTW - don't bother responding to this, Grahame - as I'm not going to follow it, anymore!!!
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